Bail out of debuginfo if stabs format encountered (RhBug:453506)

- The previous "silently ignore" policy produces bogus debuginfo
  packages on some architectures and fails with other mysterious
  errors on others, better just fail hard until (if ever) somebody adds
  stabs support.

tools/debugedit.c

@@ -1570,10 +1570,11 @@ main (int argc, char *argv[])
 	case SHT_PROGBITS:
 	  name = strptr (dso, dso->ehdr.e_shstrndx, dso->shdr[i].sh_name);
 	  /* TODO: Handle stabs */
-#if 0
 	  if (strcmp (name, ".stab") == 0)
-	    edit_stabs (dso, i);
-#endif
+	    {
+	      fprintf (stderr, "Stabs debuginfo not supported: %s\n", file);
+	      exit (1);
+	    }
 	  if (strcmp (name, ".debug_info") == 0)
 	    edit_dwarf2 (dso);